111553121 has 2 divisors, whose sum is σ = 111553122. Its totient is φ = 111553120.

The previous prime is 111553109. The next prime is 111553139. The reversal of 111553121 is 121355111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89038096 + 22515025 = 9436^2 + 4745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111553121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111553093 and 111553102.

It is not a weakly prime, because it can be changed into another prime (111553621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55776560 + 55776561.

It is an arithmetic number, because the mean of its divisors is an integer number (55776561).

Almost surely, 2^111553121 is an apocalyptic number.

It is an amenable number.

111553121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111553121 is an equidigital number, since it uses as much as digits as its factorization.

111553121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 20.

The square root of 111553121 is about 10561.8710937030. The cubic root of 111553121 is about 481.3865018760.

The spelling of 111553121 in words is "one hundred eleven million, five hundred fifty-three thousand, one hundred twenty-one".